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Why optical filters are used in electronic displays

Optical filters are used to selectively block certain wavelengths of light, while allowing others to pass through freely. People think of optical filters purely in terms of photography. However, in this context the word “light†means far more than just the wavelengths that we can all see. Visible light is just one small area of the much larger electromagnetic spectrum, which includes all forms of radiation, from microwaves to radio signals. People often use the term “optical filter†as a generic catch-all term that includes infra-red, ultra-violet and radio frequency interference (Rfi) shields. In general terms, however, an optical filter allows visible light to pass through, while blocking infra red radiation. This can be clarified to transmit visible light of only certain wavelengths. The end result is low glare, low electrical resistance and high colour density. Optical shields are used in photography, astronomy, window glass, movie projectors and, increasingly, electronic displays. These filters are typically made of scratch-resistant acrylic plastic, and contain linear polarisers to cut down reflections and glare. Polarising optical filters confine light to a single plane, and will block or transmit light according to their polarising effect - sunglasses work in the same way. With the majority of electronic displays today being of the flatscreen/LCD type, optical filters have a major part to play in, for example, defence, financial, educational and medical institutions, as well as for business and home use. We at Instrument Plastics supply optical filters, including Optolite polarizing filters, for use in electronic displays of all sizes.

Optical filters are used to selectively block certain wavelengths of light, while allowing others to pass through freely. People think of optical filters purely in terms of photography. However, in this context the word “light†means far more than just the wavelengths that we can all see.

Visible light is just one small area of the much larger electromagnetic spectrum, which includes all forms of radiation, from microwaves to radio signals. People often use the term “optical filter†as a generic catch-all term that includes infra-red, ultra-violet and radio frequency interference (Rfi) shields. In general terms, however, an optical filter allows visible light to pass through, while blocking infra red radiation. This can be clarified to transmit visible light of only certain wavelengths. The end result is low glare, low electrical resistance and high colour density.

Optical shields are used in photography, astronomy, window glass, movie projectors and, increasingly, electronic displays. These filters are typically made of scratch-resistant acrylic plastic, and contain linear polarisers to cut down reflections and glare. Polarising optical filters confine light to a single plane, and will block or transmit light according to their polarising effect - sunglasses work in the same way.

With the majority of electronic displays today being of the flatscreen/LCD type, optical filters have a major part to play in, for example, defence, financial, educational and medical institutions, as well as for business and home use.

We at Instrument Plastics supply optical filters, including Optolite polarizing filters, for use in electronic displays of all sizes.

About the Author

The Article is written by instrumentplastics.co.uk providing Electronic Display and Infrared Filter Products.

Should I choose Linear PCM or Bitsream when watching blu-rays on my PS3?

When watching blu-ray movies on my PS3, should I be choosing Linear PCM or Bitstream as my Audio Output? When I select bitstream, the screen tells me that some sections may be left out, but I think bitstream sounds better.

in your case.. the bitstream. you actually lose audio if you use PCM because your not using the HDMI. If you connect via HDMI then PCM because it can output the signal at a high enough speed to be decoded into its proper channels.

Balluff Introduces Comprehensive Line of EtherNet/IP™ Machine Mount I/O Blocks
Balluff’s new line of EtherNet/IP™ includes twelve versions of machine-mount I/O blocks and an IP 67 unmanaged switch which are designed to offer immediate cost savings with long term performance. (PRWeb Mar 10, 2010) Read the full story at http://www.prweb.com/releases/Balluff/new_line_blocks/prweb3704084.htm

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